Essential Books

Efficient Typeface loading

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Loading custom fonts can be lead to a bad performance. I highly recommend to use this little helper which saves/loads your already used fonts into a Hashtable. 

public class TypefaceUtils {

private static final Hashtable<String, Typeface> sTypeFaces = new Hashtable<>();

/**
 * Get typeface by filename from assets main directory
 *
 * @param context
 * @param fileName the name of the font file in the asset main directory
 * @return
 */
public static Typeface getTypeFace(final Context context, final String fileName) {
    Typeface tempTypeface = sTypeFaces.get(fileName);

    if (tempTypeface == null) {
        tempTypeface = Typeface.createFromAsset(context.getAssets(), fileName);
        sTypeFaces.put(fileName, tempTypeface);
    }

    return tempTypeface;
}

}

Usage: 

Typeface typeface = TypefaceUtils.getTypeface(context, "RobotoSlab-Bold.ttf");
setTypeface(typeface);
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Custom Fonts:
* Custom Fonts
* Working with fonts in Android O
* Custom font in canvas text
* Custom font to whole activity
* Using a custom font in a TextView
* Apply font on TextView by xml Not required Java code
* Efficient Typeface loading
* Putting a custom font in your app
* Initializing a font
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